create table t1 (a datetime,
# get_datetime_value
b int as (a > 1),                             # Arg_comparator
c int as (a in (1,2,3)),                      # in_datetime
d int as ((a,a) in ((1,1),(2,1),(NULL,1))),   # cmp_item_datetime
# other issues
e int as ((a,1) in ((1,1),(2,1),(NULL,1)))    # cmp_item_row::alloc_comparators()
);
Warnings:
Warning	1292	Incorrect datetime value: '1'
Warning	1292	Incorrect datetime value: '2'
Warning	1292	Incorrect datetime value: '3'
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` datetime DEFAULT NULL,
  `b` int(11) AS (a > 1) VIRTUAL,
  `c` int(11) AS (a in (1,2,3)) VIRTUAL,
  `d` int(11) AS ((a,a) in ((1,1),(2,1),(NULL,1))) VIRTUAL,
  `e` int(11) AS ((a,1) in ((1,1),(2,1),(NULL,1))) VIRTUAL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
Warnings:
Warning	1292	Incorrect datetime value: '1'
Warning	1292	Incorrect datetime value: '2'
Warning	1292	Incorrect datetime value: '3'
insert t1 (a) values ('2010-10-10 10:10:10');
select * from t1;
a	b	c	d	e
2010-10-10 10:10:10	1	0	0	NULL
Warnings:
Warning	1292	Incorrect datetime value: '1'
Warning	1292	Incorrect datetime value: '1'
Warning	1292	Incorrect datetime value: '2'
Warning	1292	Incorrect datetime value: '1'
Warning	1292	Incorrect datetime value: '1'
Warning	1292	Incorrect datetime value: '2'
select * from t1;
a	b	c	d	e
2010-10-10 10:10:10	1	0	0	NULL
Warnings:
Warning	1292	Incorrect datetime value: '1'
Warning	1292	Incorrect datetime value: '2'
Warning	1292	Incorrect datetime value: '1'
Warning	1292	Incorrect datetime value: '1'
Warning	1292	Incorrect datetime value: '2'
drop table t1;
create table t1 (a datetime,
b datetime as (least(a,1))                    # Item_func_min_max::get_date
);
insert t1 (a) values ('2010-10-10 10:10:10');
select * from t1;
a	b
2010-10-10 10:10:10	0000-00-00 00:00:00
Warnings:
Warning	1292	Incorrect datetime value: '1'
select * from t1;
a	b
2010-10-10 10:10:10	0000-00-00 00:00:00
Warnings:
Warning	1292	Incorrect datetime value: '1'
drop table t1;